RFR: 8297173: usageTicks and totalTicks should be volatile to ensure that different threads get the latest ticks [v2]

[Poison]

> As the title says, add the volatile modifier.

Poison has updated the pull request incrementally with one additional commit since the last revision:

  8297173: usageTicks and totalTicks should be volatile

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11199/files
  - new: https://git.openjdk.org/jdk/pull/11199/files/dd459966..f6b19bb0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11199&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11199&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11199.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11199/head:pull/11199

PR: https://git.openjdk.org/jdk/pull/11199